Indoor Track Yasso's 800's

Although foot still hurts, I was able to complete six 800 m intervals (with the ladies).  These ladies really surprised me with their incredible endurance. When is my foot going to stop hurting?  I am trying to do some foot exercises to strengthen those tendons and muscles in the foot. I hope they work.

1	2	3	4	5	6
800	800	800	800	800	800
3:24	3:28	3:23	3:32	3:26	3:26

I believe my times are not that bad. Maybe I am getting better without noticing it. I doubt I was able to do more than six intervals though.